Altamira Gold Welcomes Leading Authority on Porphyry Deposits Dr. Richard Sillitoe as Technical Advisor

Altamira Gold Corp. (TSXV: ALTA,OTC:EQTRF) (FSE: T6UP) (OTCQB: EQTRF) ("Altamira" or the "Company"), is pleased to announce the appointment of Dr. Richard Sillitoe as technical advisor to support exploration work across its Cajueiro Porphyry Gold District, Brazil.

Dr. Sillitoe is recognized as one of the world's leading authorities on porphyry and epithermal systems. During more than five decades as an independent consultant, he has worked with mining companies, international agencies and government groups in over 100 countries. His field-based approach to deposit modelling has contributed to the discovery and advancement of major copper and precious metal deposits around the world.

A prolific contributor to economic geology, Dr. Sillitoe has authored more than 130 technical papers and several books documenting key discoveries throughout the circum-Pacific region. His contributions have earned industry awards in Europe, Australia and the Americas, including the Penrose Gold Medal from the Society of Economic Geologists, where he served as president from 1999 to 2000.

Dr. Sillitoe earned his PhD from the University of London in 1968. He began his career with the Geological Survey of Chile before returning to London for a Shell postdoctoral fellowship at the Royal School of Mines. He later established a global consulting practice that has fundamentally shaped modern understanding of porphyry and epithermal systems.

CEO Mike Bennett commented; "We are very pleased to have Dick join us at a key stage for the Company. We have multiple gold prospects in a demonstrated porphyry district at Cajueiro. His knowledge of mineralized porphyry and epithermal systems is unmatched, and his perspective will help us refine our targeting and advance the porphyry potential we are seeing across our Cajueiro District. With two rigs currently drilling on site, we will continue follow-up drilling of the new discoveries and move ahead with expansion drilling at the Maria Bonita and Central gold deposits."

Drilling Update

Diamond drilling with two rigs is currently in progress at both the Maria Bonita deposit and the Cajueiro Central deposit.

Qualified Person

Guillermo Hughes, FAIG and M Aus IMM., a consultant to the Company as well as a Qualified Person as defined by National Instrument 43-101, supervised and approved the preparation of the technical information in this news release.

About Altamira Gold Corp.

The Company is focused on the exploration and development of gold projects within western central Brazil, strategically advancing five projects spanning over 100,000 hectares within the prolific Juruena Gold Belt-an area that has historically yielded over 6 million ounces of placer gold³. The Company's advanced Cajueiro project contains two gold deposits. The central area comprises NI 43-101 resources of 5.66Mt @ 1.02 g/t gold for a total of 185,000 oz in the Indicated Resource category and 12.66Mt @ 1.26 g/t gold for a total of 515,000oz in the Inferred Resource category. In addition, the Maria Bonita gold deposit comprises additional open pit Indicated Resources of 24.19Mt @ 0.46g/t for a total of 357,800oz, and Inferred Resources of 25.64Mt @ 0.44g/t for a total of 362,400oz.

Ongoing exploration and fieldwork at Cajueiro indicate the presence of multiple porphyry gold systems, reinforcing its potential for district-scale development. These hard-rock gold sources align with historical alluvial gold production, highlighting the region's exceptional gold endowment and potential scalability. With two independently established mineral resources, a highly prospective geological setting and a track record of significant discoveries, the Company is well-positioned to unlock further value across its extensive land package.

¹NI 43-101 Technical Report, Cajueiro Project, Mineral Resource Estimate: Global Resource Engineering, Denver Colorado USA, 10^thOctober 2019; Authors K. Gunesch, PE; H. Samari, QP-MMSA; T. Harvey, QP-MMSA

² NI43-101 Technical Report, Mineral Resource for the Maria Bonita Prospect: VMG Consultoria, Belo Horizonte, Minas Gerais, Brazil. 12^th June 2025; Author V. Myadzel

³ Juliani, C. et al; Gold in Paleoproterozoic (2.1 to 1.77 Ga) Continental Magmatic Arcs at the Tapajós and Juruena Mineral Provinces (Amazonian Craton, Brazil): A New Frontier for the Exploration of Epithermal-Porphyry and Related Deposits. Minerals 2021, 11, 714. https://doi.org/10.3390/min11070714

On Behalf of the Board of Directors,

Neither TSX Venture Exchange nor its Regulation Services Provider (as that term is defined in policies of the TSX Venture Exchange) accepts responsibility for the adequacy or accuracy of this release.

The securities described herein have not been registered under the U.S. Securities Act or any state securities laws, and may not be offered or sold in the United States absent registration or an applicable exemption from registration requirements under the U.S. Securities Act and any applicable state securities laws.

Forward-looking Statements

Certain information contained herein constitutes "forward-looking information" under Canadian securities legislation. Forward-looking information includes, but is not limited to, statements with respect to the extension of the Warrants. Generally, forward-looking information can be identified by the use of forward-looking terminology such as "will", "intends" or variations of such words and phrases or statements that certain actions, events or results "will" occur. Forward-looking statements are based on the opinions and estimates of management as of the date such statements are made and they are subject to known and unknown risks, uncertainties and other factors that may cause the actual results to be materially different from those expressed or implied by such forward-looking statements or forward-looking information, including the receipt of all necessary regulatory approvals. Although management of the Company has attempted to identify important factors that could cause actual results to differ materially from those contained in forward-looking statements or forward-looking information, there may be other factors that cause results not to be as anticipated, estimated or intended. There can be no assurance that such statements will prove to be accurate, as actual results and future events could differ materially from those anticipated in such statements. Accordingly, readers should not place undue reliance on forward-looking statements and forward-looking information. The Company will not update any forward-looking statements or forward-looking information that is incorporated by reference herein, except as required by applicable securities laws.

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